[M5] verify-curated-db.sh + boost recipe (header-only)

scripts/curated-snippets/spdlog.cpp

@@ -0,0 +1,8 @@
+#include <spdlog/spdlog.h>
+import std;
+
+int main() {
+    spdlog::set_level(spdlog::level::info);
+    spdlog::info("spdlog ok");
+    return 0;
+}